Lifting jack



May 6, 1930. J. G. EVERSTAM LIFTING JACK Filed Dec. 24, 1925 lime/afar v JOHHN Guwnn EVERSTHM 7 Patented May 6,1930 7 r I A i v YJofiAN- etiixfmiitfnviiiisichm, Q 'FQSU'ND sVALL, SWEDEN i 3 l me jiKdK I V e ucean filed manner 24, 1'92'55 see-e1 m. 77,'5 z"7, and= in Svieden' August 1925.

The :present invention relates'to an in1- tions of' a slightly'm'odifie'd 'embodiniento'f pr'ovementin such-liftingj acks infivhich the thestop; v V memberfwhic'h 'may'he raised and lowered "Inthe embodimentillustrated in Fig-3'1, by means f thejaek mechanism PIOPBPf; lde'notes 'theifram'e 'oftheflifting "jack 'in Whether 'saidrmechanisin consists of feeding' which the 'member12is movable up 'and'jdown pawls, cylindrical 01 conical toothedigear in'the lisu'ahniannerby'meens cfith 'e lifting ing, or -a"hydraulic=device+siipports=aind jaclrmechnisin prcper. "ln'theembodiment or the like whichisatljustablein the said 'illustrated 'saidmechanism"is shjoivn asc'onmember zind sef-vestovsnpport the l'0ad,"and sisting of feeding pawls 18, 19, which' engage theidilficult and time-Wasting propping 'up nay he 'actuate'd by means of'e liahdler the (ifth'e lifting rj'ackothei'wiseoft'en necessary, like, net illustrated,Whichis'introduedinto and which fortl1is;pu1'p0se may'be lockedby a sleeve-"5, which is pivoted en 'a pin lin 'mea'ns'ofnicatchdevice. inthe desired positie'fraineli Thefniem'berfl 'w-hihmay he ti6n relativelyto theupland i do-wn 'movable raisedand lowered in this mannerfisiprofi meinber according tothe heightof theibod-y vided with a laterally projected arm' '6 'which underneath which the "lifting jack is to be may be intr'oducediinderneath theload wliich "placed and "which is Ito -be :raised by means ---it-.is desii'ed to lift. *Inbrcle'r :to'avoidthe of 'thejack. The liftingjacksef this type 1 necessity 10f proppihgup'the "liftin'grjack. in

Q2 hitherto used in Which the Catch device :is. case of -giefi er- ,lleightspf the load to "be moved 'by hand into as wellasUntefengage- 'lifted, :the re ls'also. provided inFthe membef V r1nent,'are encumbefed With-theidisedvantage -2 ta slid-able rod Twhich siippcrtsat itsnp that one is idiot able ;-t0;disengage theacatch :perend theiusuahplate 8,12'vhich isiritreduced clevice Whenthe weight of the load restson pun'dei'neath the flo'ad'to belifted. The-rod the 1 0d, -a nd it is therefore often di'ificultto. 7iis'also]:provided on One side "with teethz9 remove the-lifting jacka'fterus'e. Whichmay be engaged hy a czitch lOi-pivoted The purpose of the inventionis to'r eniove a't the "upper endrcftthe Inefnber:2"and'actuthis c'lisa'dvantage, andthe invention con; -ated byecbilspringQO"Whihtehdstb-niove sists;pri-nci@pallyin that there isiprovided on :saiclcateh ihtcengagement, with the "teeth '30 the Tfriune of the jack a stop which is located 9. By-ineans o'f'this' batch de'vic'e thesrod 7 to a "certwin position, so that the red fWi'll loei Q saidprojectionstrikesagainstthe:SQQP

'hnd 2 and 3 show twbqt tl'ifirentelevain the path of movement'of a projection or- 'andplate 8 may thusahe-adjusted'in difierelit the like iprov'i'dedmn the catch-member 0f 'frpOSiti'OnsOf-hei'ght relatively-to the meinbe'r the catch device, in such manner that upen '-2,-accordingtoftheheightcfthebcdy tinderlowering o-f-the up anddo'wn mov ahle memrneath which thelifting 'j ackis to he v lzic'ed.

5 her said projection strikes against the st0p "Acc'o'rding to, the, invention there p1-0- and thns moves thfecatcih member [ont of vided bn the fra'rne l a 'stop llwhich is, located engagement. The catch 'device will thns be in-onInaybemWeCl into the path Of met eautomatically disengaged-es soon as theup ment of a prcjection'fi pnthe ;catc h;1 0 in anclflc-vvn movable member has been lowered ch manner that 'upcnlc tverin 'g' ef the mem- -clrop-d0wn; imdthe liftingyjeck"b'econiescfree 151 and-thus turnsthe catc '10 fqiitefiengege; and may beremov'i Itis advantageous to jm'ent withtheiteethfi) 611 r061 .gThecd nia ke the said step adjustable sojthatit may TfillllsbCQIIiGS freeand vyfill mpg) iz rjd n be moved into and outrofthe .pathef moveasi'txwill ge into the "HIGIIl'bQl' Q, after which ment c-fthe pfoject-ien a's may hede'sired. the lifting jack inay asily beipull dasigei '95 5111 the accompanying dfawing a .feW fem- In-thee1nbcdiment illustrated in -Fg f1 th,e

bddiments 'o'f the invention aneillustrated by stojp l ltheishalpepf mst i wayiif example. Fig 1 shows a-side yiew which is ElVQtGd G- II"al-bQllify k 1Cf' a1iefti'ng ,ijadk taccordjing to, the intention, be turned means ofa lien slidable in two lugs 17 on the frame 1, so'

that by displacement of said bolt the larger portion 21 may be moved into or out 'ofthe path of movement of the projection 22, which is provided at one side of the catch23, as

shown in Fig. 3 In the position of thei bolt shown in Fig. 3, the projection 22 may, upon the smallertportion of'the bolt, so that the catch 23 will not become disengaged. If the bolt 16 is displaced "to the left in-Fig. 3, however, so that the larger portion 21 comes opposite the projection 22, said projection will, upon lowering of the member 2,, strike against the'portion 21,. so that the' catch device is automatically disengaged. VVhen the memher. is again raised, the catch 23 is again turned into engaging position bythe spring actuating thesam'e. I r

The embodiments above described and illustrated in the drawing are only to be regarded as examples, and their. details may obviously be further modified in several ways without-departing from the principle of the invention. i e

I claim:

1. In a lifting jack, thecombination of a;

frame, a member vertically guided and movable upand down in said frame, a jack mechanism for effecting the up and down movement of said. member in said frame, a rod slidable vertically insaid member and providedwith a vertical row of .teeth free from engagement with saidjack mechanism, a

catch device on said up and down movable member adapted to engage said row of teeth on said vertically slidable rod and thereby to lock said rod to said member in a number of difierent positions,-said. catch device having aprojection, located in thepath of movement ofsaid projection. and adapted upon lowering of said member to engage said projection to move said catch-device out; of engagement.

combination of a 2. In a lifting jack, the frame, a member vertically able up and down in said-frame, a jack mechanism for effecting the up and down move ment of said member in said frame,"a rod movable in said meinber free from engageguided and movment with said jack mechanism, acatch device for locking said rod relativelyito said member, said catch device havingaprojection, and a stop on 'saidframe adjustable in such manner that itmay be' moved into-and out of the path of movement of said projection and adapted upon lowering of'said member to engagesaid projection so as'to release said catch? device.

.3, In a lifting jack, the emana e er a a projection,

'to releasesaid catch device.

"vided -with a vertical. row of teeth 7 from engagement with said jack mechaand a stop on sald'frame {frame adjustable in such manner he moved into and out of the pathof'move- "able-up'and downin said frame,

catch device on said up and down movable 7 member adapted to engage said row of teeth on said vertically slidable rod and thereby to lock said rod'to said member in a number of 7, different positions, a spring actuating said lowering of the member 2, move freely past" catchflevice so as to move thesame into lockingposition relatively to said rod, said catch device having a proj ection'. and a stop on said frame located in the path of movement of said projection and adapted upon lowering ofsaidmemberto engage. said projection to move said catch device out ofengagement.

4. In a lifting jack, the combination of a frame, a member vertically guided andmovable up and down in said frame, a jack mechanismfor effecting the uptand down movement of said member 1nsa1d frame, 'a rod movable 1n said member-free from engage-- ment with said jack mechanism, a catch device for' locking said rod relatively to said 'member,a spring actuating said catch device soas to move the same into locking pos1t1on relatively to said'rod, said catch device'having anda stop on said frame adjustable in such manner that it may be moved into and out of the path of movement of said projection and" adapted upon lowering of v saidmember to engage said projection so as 5.-In a lifting-jack, the combinat on of a frame,--a member vertically guided and mov able up and. down in said frame, a jack mechanism for efiecting the up and down movement of said member in said frame, a rod slidable vertically in said member'and profree row ofteeth on said vertically slidable rod and thereby to loclr said rod to saidmember ina number of different positions, device havinga projection, and astop on said that it may ment of saidprojection and adapted upon jec't-ion'so as to release said catch device.

frame, a member vertically guided and mova jack mechanism for effecting the up and down movement of said member inisaidframe, arod slidable vertically in said member and pr vided-with a'vert-ical row of teeth 'freefrom engagement'- with said j ack mechanism, a

said catch 6.=In a liftin'g' jack,'thecombination ofa 1 catch device on said up and down movable as able up and down in said frame, a jack mechg on said vertically sliclable rod and thereby to lock said rod to said member in a number of different positions, a spring actuating said catch device so as to move the same into lock- 5 ing position relatively to said rod, said catch device having a projection, and a stop on said frame adjustable in such manner that'it may be moved into and out of the path of mo've ment of said projection and adapted upon lowering of said member to engage said proj ection so as torelease said catchrdevice.

7. In a lifting jack, the combination of a frame, a member vertically guided and movable up and down in said frame, a jack mechanism for effecting the up and down move ment of said member in said frame, a: rod

slidable vertically in said member and provided with a vertical row of teeth free from engagement with said jack ,mechanism, a

member adapted to engage said row of teeth on said vertically slidable rod and thereby to lock said rod to said member in a number 7 of difierent positions, said catch device consisting of a pawl, a projecting arm on said pawl, and a pin on which said pawl is pivoted in the up and down movable member, and a stop on said frame located in the path of 1 movement of said projecting arm on said pawl and adapted upon lowering of said member to engage said projecting arm. to

move said pawl out of engagement. 7 8. In a lifting jack, the combination of a. frame, a member vertically guided and m0vanism for efiecting the up and down move ment of said member in said frame, a rod slidable vertically in said member and provided with a verticalrow of teeth free from 40 engagement, with said jack mechanism, a catch device on said up and down movable member adapted to engage said row of teeth v T on said vertically slidable rod and thereby to lock said rod to said member in a number of different positions, said catch device consisting of a pawl, a projecting arm on said pawl,v a pin'on whichsaid pawl is pivoted in the up and down movable member, and a spring actuating said pawl so as to move the same into locking position relatively. to said rod, and a stop onsaid frame located in'the path of movement of said projecting arm on said pawl and adapted upon lowering of said member to engage said projecting arm to move said pawl out of engagement.

J OHAN GUN NAR EVERSTAM.v 

